Question

A uniform disc of mass $5$ $kg$ and radius $2$ $m$ is rotating with $10$ $rad/s$. Now another identical disc is gently placed on first disc. Because of friction both disc acquire common angular velocity. Loss of kinetic energy in process is ________J.

• A. 125
• B. 250
• C. 62.5
• D. 500

Answer 1

Answer: (B)

250

Answer 2

The Correct Option is (B): 250